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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077040b37a2e612af06e5ddce8fbd7294ec4b9b3ef1ce8ca74a93554a0341f77' 
  AND token = 'hyUBL9yHCngVIlPipHfN29sqaC9Olf5I1dsIpYfWnso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}